Wide-range anti-saturation digital signal amplitude demodulation method and demodulator
A demodulation method and signal amplitude technology, applied in the direction of amplitude modulation pulse demodulation, pulse shaping, etc., can solve the problems that traditional demodulators cannot work normally, and achieve the effect of avoiding switching and expanding the working range
Active Publication Date: 2019-10-15
HUAZHONG UNIV OF SCI & TECH
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[0004] Aiming at the defects of the prior art, the object of the present invention is to provide a large-range anti-saturation digital signal amplitude demodulation method and a demodulator, aiming to solve the problem of the traditional demodulator when the modulated waveform is abnormal due to the over-range of the signal to be measured. Problems that don't work
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[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0025] Since the modulated signal is similar to a single-frequency signal within one cycle, its amplitude is the modulated signal. For the over-range input signal, part of the data within the range still retains the correct amplitude information, as long as the amplitude can be extracted, demodulation can be realized. Based on this idea, the present invention uses a digital amplitude demodulator, combined with a saturation detection algorithm, to solve the shortcoming that the traditional quadrature demodulation technology cannot work normally when the input signal exceeds the range, greatly expand...
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The invention belongs to the field of circuit technology and measurement control, and discloses a wide-range anti-saturation digital signal amplitude demodulation method and a demodulator. The methodcomprises the following steps: (1) converting a signal to be demodulated into a digital signal; and (2) when it is judged that the digital signal is saturated, adopting a saturated digital demodulation method for demodulation. The saturated digital demodulation method comprises the following steps: judging a zero crossing point of a signal to be demodulated, and outputting a state quantity whetherthe signal crosses the zero or not; accumulating and outputting the current phase when the signal crosses zero; obtaining a function value corresponding to the current phase according to the currentphase; obtaining the amplitude of the current moment according to the signal to be demodulated and the function value; and reconstructing an amplitude signal by utilizing interpolation and filtering operation. The digital amplitude demodulator is used, the defect that a traditional quadrature demodulation technology cannot work normally when an input signal exceeds the range is overcome, the working range of the demodulator is greatly expanded, meanwhile, switching of the measuring range is avoided, and the demodulator can work in the highest resolution mode all the time.
Description
technical field [0001] The invention belongs to the field of circuit technology and measurement control, and more specifically relates to a large-range anti-saturation digital signal amplitude demodulation method and a demodulator. Background technique [0002] In various precision measurements, the physical quantity to be measured is usually converted into electrical signals such as resistance and capacitance, and then the electrical signal is extracted by using a specific functional circuit, and the actual value of the physical quantity to be measured is calculated according to the system sensitivity. In order to solve the influence of various low-frequency noises on the measurement, the method of modulation and demodulation is usually used. The idea is to use high-frequency signals to modulate the value to be measured, and then perform quadrature demodulation after band-pass filtering to suppress noise interference outside the bandwidth. The circuit demodulates the amplit...
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IPC IPC(8): H03K9/02H03K5/08
CPCH03K5/08H03K9/02
Inventor 李洪银周泽兵吴书朝白彦峥王铖锐肖春雨
Owner HUAZHONG UNIV OF SCI & TECH